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This jacket just doesn't go well with this skirt.
Literal
This jacket [topic-は] this skirt [to-に] somehow fit-well come-not.
しっくり来ない (come ない) is the negative of しっくり来る 'to feel right / click,' the 来る variant of しっくりする. どうも 'somehow / no matter what I do' adds the sense that the speaker has tried and can't make it work. A natural, everyday observation about clothes not matching.